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Well-Known Member

Practice on some scrap aluminum, those carbide bits like to hop around sometimes, and they cut really well, so before you know it you can cut too much and ruin the cylinder. A friend of mine got a little excessive in clearing down the transfer ports, the wall was too thin and failed, of course the rings went with it and the rest of the motor with that situation.

Member

Practice on some scrap aluminum, those carbide bits like to hop around sometimes, and they cut really well, so before you know it you can cut too much and ruin the cylinder. A friend of mine got a little excessive in clearing down the transfer ports, the wall was too thin and failed, of course the rings went with it and the rest of the motor with that situation.

Well-Known Member

bad porting isn't necessarily ugly, sometimes it's just that some bonehead didn't do any math. you go too far in one direction, not far enough in another, mess up an angle somewhere else, and end up making less power than stock.

Active Member

ohh so you might not know you messed up until it's all together and test it out.

question tho where should I attach a degree wheel so I know what the port timing is before changing anything? I think I can find a printout-able wheel and make a pointer. i can sacrifice the stock jug if I bungle it, I have a new one for backup